COS()

Cosine of the argument

Syntax

      COS( nRadiant ) -> nCosine

Arguments

<nRadiant> an angle size given in radiants

Returns

<nCosine> the cosine of <nRadiant>

Description

The function COS() calculates the cosine of an angle whose size is given in radiants (full angle equals 2*Pi – see DTOR() for angle size given in degress). A common geometric interpretation of the COS() function is the ankathede-hypotenuse-ratio of a right-angled triangle.

Examples

      ? cos( 0.0 ) // --> 1.0
      ? cos( 1.0 ) // --> 0.5403...

Tests

      cos( 0.0) == 1.0
      cos( PI() / 4 ) == sqrt( 1 / 2 )
      cos( PI() / 2 ) == 0.0
      cos( PI() ) == -1.0

Compliance

COS() is compatible with CT3’s COS().

Platforms

All

Files

Source is trig.c, library is libct.

Seealso

SIN(), TAN(), COT(), ASIN(), ACOS(), ATAN(), ATN2(), SINH(), COSH(), TANH(), RTOD(), DTOR(), PI()